That bit of play at the end of the tape isn't a manufacturing flaw. The hook slides by exactly its own thickness: when you hook it over an edge, it pulls out and zero starts at its inner face; when you push it against a wall, it slides in and zero becomes its outer face. That way, both measurements are accurate. Bend or tighten it, and your tape is off by a millimetre or two.
Chlorine on its own is fairly gentle. But when it combines with urine, sweat and other grime from swimmers, it forms chloramines, which cause stinging eyes and that classic 'chlorine smell'. A well-kept pool barely smells at all. Shower before you swim and never pee in the water.
Muscle mass slowly shrinks with age, putting independence at risk. But in 1990, a study had nursing home residents aged 86 to 96 train their legs for eight weeks: their strength more than doubled. Muscle responds to training at any age. Getting up from a chair without using your hands is already an exercise.